Connected: An Internet Encyclopedia
RFC 1123 - 4.1.2.5 Data Connection Management: RFC-959 Section 3.3

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### 4.1.2.5 Data Connection Management: RFC-959 Section 3.3

A User-FTP that uses STREAM mode SHOULD send a PORT command to assign a non-default data port before each transfer command is issued.

DISCUSSION:

  This is required because of the long delay after a TCP connection is closed until its socket pair can be reused, to allow multiple transfers during a single FTP session. Sending a port command can avoided if a transfer mode other than stream is used, by leaving the data transfer connection open between transfers.

Next: 4.1.2.6 PASV Command: RFC-959 Section 4.1.2

Connected: An Internet Encyclopedia
RFC 1123 - 4.1.2.5 Data Connection Management: RFC-959 Section 3.3